The given function is $f(x) = 7x$, and you're asked to evaluate it for $x = -3$ and $x = 5$.

Let's calculate the values:

1. For $x = -3$: $f(-3) = 7(-3) = -21$

2. For $x = 5$: $f(5) = 7(5) = 35$

Thus, the evaluations are:

• $f(-3) = -21$
• $f(5) = 35$

Would you like more details or have any questions?

Here are 5 related questions to expand on this topic:

1. What happens to $f(x)$ if $x = 0$?
2. How would the function change if $f(x) = 7x + 2$?
3. What is the slope of the function $f(x) = 7x$?
4. How would you solve for $x$ if $f(x) = 49$?
5. How do you determine if a function is linear or nonlinear?

Tip: When evaluating functions, substitute the given value of $x$ directly into the function and simplify step by step.